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Coupled‐line band‐pass filter with T‐shaped structure for high frequency selectivity and stopband rejection
Author(s) -
Xu KaiDa,
Lu Sen,
Ren Yi,
Zhang Anxue,
Chen Qiang
Publication year - 2020
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.22259
Subject(s) - stopband , passband , transition band , frequency selectivity , center frequency , band pass filter , stub (electronics) , electrical impedance , physics , selectivity , filter (signal processing) , topology (electrical circuits) , acoustics , electronic engineering , materials science , computer science , prototype filter , low pass filter , optics , engineering , chemistry , electrical engineering , computer vision , catalysis , quantum mechanics , biochemistry
A coupled‐line band‐pass filter (BPF) with T‐shaped stub structure is presented. Five transmission poles within the passband and eight deep transmission zeros (TZs) from 0 to 2 f 0 ( f 0 denotes filter's center frequency) are realized through input impedance calculations. With the simple T‐shaped structure, the positions of six TZs can be appropriately adjusted to achieve high frequency selectivity and stopband rejection. For demonstration, a BPF prototype centered at 2.05 GHz is designed and fabricated, whose measured rejection levels are of over 45.5 dB at lower stopband and better than 19.5 dB at upper stopband. The simulation and measurement results are in good agreement, which validates the design idea.